My 5140i is still going strong since 2005! Only problem is I can't find an internet supplier who will help me install configuration details so I can surf with the miniature screen. Can anyone help me with this? I live in Sweden and use the state syst...

Of course a 3g sim will work in it. A 4g sim would also work in it. In fact a 3g/4g sim will even work in a Nokia 2110 or a Motorola MicroTAC. Thing is the phone itself is only 2g, and its the telco shutting down 2g, hence why the phone has to be rep...